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RE40944 |
Adjustable shear valve mud pulser and controls therefor
A telemetry system involving a shear-type mud pulser valve as the preferred embodiment is described. The control system includes a motor driver for the mud pulser which, in essence, moves one...
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7429934 |
Mud pulse landing assembly for use in directional drilling
A mud pulse landing assembly ( 10 ) which allows for the removal of the mud pulse generator ( 16 ) containing the mud pulse orifice ( 106 ), thus creating an unobstructed passageway for any tool or...
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7430153 |
Downhole tool and method
A downhole tool for generating a fluid pressure pulse, and to a method of generating a fluid pressure pulse downhole. One example being, an improved downhole tool and method for transmitting data...
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7423932 |
Well bore communication pulser
The poppet portion of a signal valve is driven rotationally by a mud motor and the rotation is used, in conjunction with a rotary-to-linear motion converter, to cause the poppet to move axially...
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7417920 |
Reciprocating pulser for mud pulse telemetry
A method of transmitting pressure pulses from a downhole location through a flowing fluid in a wellbore comprises using a linear actuator to controllably move a reciprocating member axially back...
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7408837 |
Measurement while drilling tool and method
An apparatus for telemetering a downhole parameter from a well. The apparatus comprises a housing having a bore. The apparatus further comprises an annular main valve with an enlarged end...
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7382686 |
Drilling signalling system
A pressure pulse generator for use in transmitting pressure signals to surface in a fluid-based drilling system having a housing having an inlet to admit drilling fluid to the interior of housing,...
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7327634 |
Rotary pulser for transmitting information to the surface from a drill string down hole in a well
A rotary pulser for transmitting information to the surface from down hole in a well by generating pressure pulses encoded to contain information. The pressure pulses travel to the surface where...
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7319638 |
Hydraulic oscillator for use in a transmitter valve
An oscillating valve driven by the pressure in a mud pulser develops a pressure variation in the mud pulse signal that is at a frequency that is different than the frequencies of the mud system....
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7283060 |
Control apparatus for automated downhole tools
A method and apparatus for a computer controlled apparatus for use in wellbore completions. A touch-screen is provided that facilitates commands and information that is entered by an operator...
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7250873 |
Downlink pulser for mud pulse telemetry
A mud pulse telemetry system comprises a surface located fluid supply line having a drilling fluid flowing therein. A non-venting pulser is disposed in the drilling fluid in the supply line, and...
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7187298 |
Methods and systems for transmitting and receiving a discrete multi-tone modulated signal in a fluid
Methods and systems for transmitting and receiving a discrete multi-tone (DMT) modulated signal in a fluid. Some illustrative embodiments may be a method comprising transforming an input data...
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7180826 |
Measurement while drilling bi-directional pulser operating in a near laminar annular flow channel
A device, method, and system for creating a pressure pulse from drilling fluid within a drill string in a down hole drill collar for enabling measurement-while drilling. The device and system are...
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7139219 |
Hydraulic impulse generator and frequency sweep mechanism for borehole applications
This invention discloses a valve that generates a hydraulic negative pressure pulse and a frequency modulator for the creation of a powerful, broadband swept impulse seismic signal at the drill bit...
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7123161 |
Method and apparatus enhanced acoustic mud pulse telemetry
A method and system for telemetry through a drilling fluid during drilling is disclosed. A reflector ( 110 ) is positioned downstream from the drilling mud pumps ( 80 ) and causes reflected...
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7057524 |
Pressure pulse generator for MWD
A pressure pulse generator to generate pressure signals in drilling fluid for transmission to surface includes an outer housing having an inlet and an outlet for supply to the drilling assembly; a...
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6898150 |
Hydraulically balanced reciprocating pulser valve for mud pulse telemetry
A reciprocating pulser system for generating pressure fluctuations in a flowing drilling fluid comprising a reciprocating poppet and a stationary valve assembly with axial flow passages. The poppet...
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6795373 |
Permanent downhole resonant source
A wellbore system and method for producing seismic waves in an earth formation. The system comprises a cavity containing fluid. The cavity is in a space between a wellbore tubular, which may be...
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6757218 |
Semi-passive two way borehole communication apparatus and method
The present invention provides a semi-passive two-way borehole communication system and method. The system includes a surface source signal generator for generating an acoustic signal. The acoustic...
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6484817 |
Signaling system for drilling
A pressure pulse generator for use in transmitting pressure signals to surface in a fluid-based drilling system. The generator is arranged in use in the path of a pressurized fluid to operate a...
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6469637 |
Adjustable shear valve mud pulser and controls therefor
A telemetry system involving a shear-type mud pulser valve as the preferred embodiment is described. The control system includes a motor driver for the mud pulser which, in essence, moves one...
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6414905 |
Method and apparatus for communicating coded messages in a wellbore
A method and apparatus for communicating coded messages in a wellbore between a transmission node and a reception node is provided. The coded messages are messages are impressed upon a fluid column...
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6219301 |
Pressure pulse generator for measurement-while-drilling systems which produces high signal strength and exhibits high resistance to jamming
A system is disclosed for generating and transmitting data signals to the surface of the earth while drilling a borehole, the system operating by generating pressure pulses in the drilling fluid...
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6097310 |
Method and apparatus for mud pulse telemetry in underbalanced drilling systems
A mud pulse telemetry system uses a downhole pulser to produce sequences of positive and/or negative pulses according to a selected pattern. Positive pulses, negative pulses, and combinations...
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6094401 |
Inverse vertical seismic profiling using a measurement while drilling tool as a seismic source
A reverse VSP system is provided and uses a frequency-controllable modulator of an MWD tool as a downhole seismic source. The modulator has a rotor and stator arranged to provide substantially...
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6055213 |
Subsurface well apparatus
Method and apparatus for actuating one or more downhole well tools carried by a production or workstring conduit having an imperforate wall and for blocking fluid communication between an...
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6016288 |
Servo-driven mud pulser
An improved servo-driven pulser is disclosed, for use in measurement while drilling applications. In the pulser, a battery powered on-board DC electric motor is used to operate a servo-valve, which...
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6002643 |
Pulser
A downhole tool containing instruments and a pulser is landed within a string of drill pipe. The pulser has a pulser body and an orifice on a lower end. A piston slides within a bore in the body...
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5740127 |
Pulse production and control in drill strings
In fluid pulsing apparatus operable in a drill pipe in a well in which well drilling fluid flows, wherein pressure pulses are created by restricting one or more of several hydraulically parallel...
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5660238 |
Switch actuator and flow restrictor pilot valve assembly for measurement while drilling tools
An apparatus for selectively activating a downhole Measurement While Drilling (MWD) tool, so as to prolong the life of the MWD battery and improve function of the MWD flow restrictor pilot valve...
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5586084 |
Mud operated pulser
A poppet and orifice mud pulser assembly is disclosed for use in an MWD system. The mud pulser is capable of generating pressure pulses in the column of drilling mud of various amplitudes to...
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5583827 |
Measurement-while-drilling system and method
In a Measurement-While-Drilling system, selecting the fixed frequency in a pulse signal generator utilizes constructive interference to enhance the signal level in an amplitude modulated signal....
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5333686 |
Measuring while drilling system
A measuring while drilling apparatus for use in the drilling of subterranean wells comprises a plurality of interconnected tubular housings which are insertable into and removable from a drill...
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5272680 |
Method of decoding MWD signals using annular pressure signals
A method is presented for obtaining borehole measurements using measurement-while-drilling apparatus wherein mud pulse telemetry signals are decoded from the annulus pressure signals (as opposed to...
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5150333 |
Method and apparatus for providing improved pressure pulse characteristics for measuring while drilling
This invention deals with a telemetering system in logging while drilling which utilizes pressure pulses in the drilling fluid circulation system. More specifically this invention deals with...
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5117398 |
Well communication pulser
A downhole mud pressure change signal generator has a signal valve to variably resist the flow of mud down the drill string bore. The valve is powered by a bias driver and controlled by a holding...
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5115415 |
Stepper motor driven negative pressure pulse generator
Variable control of the stroke and timing of the poppet in a pressure pulse generator system provides desired control for varying down hole conditions. A stepper motor interconnected to the poppet...
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5103430 |
Mud pulse pressure signal generator
A downhole signal generating mud pulser has a poppet and orifice signal valve to variably resist the drilling fluid stream. The poppet is upstream of the orifice and is moved by a piston in fluid...
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5040155 |
Double guided mud pulse valve
The present invention discloses a double guided slide valve apparatus for producing pressure pulses in drilling mud medium flowing through a drill string casing.
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4979577 |
Flow pulsing apparatus and method for down-hole drilling equipment
Flow pulsing apparatus is adapted to be connected in a drill string above a drill bit. The apparatus includes a housing providing a passage for a flow of drilling fluid toward the bit. A valve...
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4928783 |
Well borehole sound source
A sound source capable of generating high energy acoustic pulses is lowered into a well borehole. A chamber of high pressure air in the source provides the energy for the pulses. A firing mechanism...
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4905778 |
Device for producing pressure pulses in an oil well fluid medium
An apparatus for producing pressure pulses in an oil well fluid medium is established which includes a main valve member moveable relative to a supporting member by a pressure gradient between two...
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4901290 |
Apparatus for the generation of pressure pulses in drilling mud compositions
The apparatus for the generation of pressure pulses in a drilling mud composition which flows downward in a drill string (1) is composed of a valve (V) inside the drill string (1), with a...
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4869100 |
Variable orifice control means
For use in a measuring while drilling (MWD) apparatus, a variable drilling fluid flow orifice including circular valve seat and valve element in the fashion of a plug is disclosed. The plug is...
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4839870 |
Pressure pulse generator system for measuring while drilling
A measurement while drilling apparatus for transmitting information carrying signals by fluid pressure changes in a borehole fluid circulation system having a flow restriction causing a high...
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4802150 |
Mud pressure control system with magnetic torque transfer
A down-hole signal generator for a mud-pulse telemetry system comprises a flow constrictor defining a throttle orifice for the mud passing along a drill string, a throttling member displaceable...
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4771408 |
Universal mud pulse telemetry system
Multistate mud pulsing is achieved by generating both positive and negative pulses within a drill string by means of a plurality of selectively operable bypass passages around a restriction to...
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4742498 |
Pilot operated mud pulse valve and method of operating the same
Apparatus for and a method of creating positive pressure pulses in a stream of drilling mud being circulated through a drill string is disclosed. The apparatus includes a restriction in the drill...
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4734893 |
Apparatus and method for transmitting downhole conditions to the surface
A measuring while drilling tool is disclosed. The preferred embodiment incorporates an outer tubular member adapted to be connected in a drill string above the drill bit. The apparatus utilizes a...
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4686658 |
Self-adjusting valve actuator
The present invention is directed to an apparatus and method for actuating a valve. The present invention is particularly useful with a valve for imparting pressure pulses in a pressure pulse...
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